.arcconfig

automation: allow exit code of 1 for `hg push`

`hg push` exits 1 for no-ops. No-op pushes should be fine in the
context of automation.

{
    "conduit_uri": "https://phab.mercurial-scm.org/api",
    "repository.callsign": "HG",
    "arc.land.onto.default": "@",
    "base": "hg:.^"
}